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boot: Move framebuffer reservation to separate helper

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Create separate helper for just reserving framebuffer region without
creating or enabling simple-framebuffer node.

This is useful for scenarios where user want to preserve the bootloader
splash screen till OS boots up and display server gets started without
displaying anything else in between and thus not requiring
simple-framebuffer.

Signed-off-by: Devarsh Thakkar <devarsht@ti.com>
Reviewed-by: Nikhil M Jain <n-jain1@ti.com>
This commit is contained in:
Devarsh Thakkar 2024-02-22 18:38:10 +05:30 • committed by Anatolij Gustschin
parent 4ac7ffb60e
commit efe1ceec7e
3 changed files with 24 additions and 11 deletions
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12
boot/fdt_simplefb.c
View file

@ -107,7 +107,6 @@ static int fdt_simplefb_enable_existing_node(void *blob)
#if IS_ENABLED(CONFIG_VIDEO)
int fdt_simplefb_enable_and_mem_rsv(void *blob)
{
struct fdt_memory mem;
int ret;
/* nothing to do when video is not active */
@ -118,15 +117,6 @@ int fdt_simplefb_enable_and_mem_rsv(void *blob)
if (ret)
return ret;
/* nothing to do when the frame buffer is not defined */
if (gd->video_bottom == gd->video_top)
return 0;
/* reserved with no-map tag the video buffer */
mem.start = gd->video_bottom;
mem.end = gd->video_top - 1;
return fdtdec_add_reserved_memory(blob, "framebuffer", &mem, NULL, 0, NULL,
FDTDEC_RESERVED_MEMORY_NO_MAP);
return fdt_add_fb_mem_rsv(blob);
}
#endif

21
boot/fdt_support.c
View file

@ -23,6 +23,9 @@
#include <exports.h>
#include <fdtdec.h>
#include <version.h>
#include <video.h>
DECLARE_GLOBAL_DATA_PTR;
/**
* fdt_getprop_u32_default_node - Return a node's property or a default
@ -2043,6 +2046,24 @@ int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
return 0;
}
#if CONFIG_IS_ENABLED(VIDEO)
int fdt_add_fb_mem_rsv(void *blob)
{
struct fdt_memory mem;
/* nothing to do when the frame buffer is not defined */
if (gd->video_bottom == gd->video_top)
return 0;
/* reserved with no-map tag the video buffer */
mem.start = gd->video_bottom;
mem.end = gd->video_top - 1;
return fdtdec_add_reserved_memory(blob, "framebuffer", &mem, NULL, 0, NULL,
FDTDEC_RESERVED_MEMORY_NO_MAP);
}
#endif
/*
* Update native-mode in display-timings from display environment variable.
* The node to update are specified by path.

2
include/fdt_support.h
View file

@ -423,6 +423,8 @@ int arch_fixup_memory_node(void *blob);
int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
u32 height, u32 stride, const char *format);
int fdt_add_fb_mem_rsv(void *blob);
int fdt_overlay_apply_verbose(void *fdt, void *fdto);
int fdt_valid(struct fdt_header **blobp);